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論文

Ion tracks in silicon formed by much lower energy deposition than the track formation threshold

雨倉 宏*; Toulemonde, M.*; 鳴海 一雅*; Li, R.*; 千葉 敦也*; 平野 貴美*; 山田 圭介*; 山本 春也*; 石川 法人; 大久保 成彰; et al.

Scientific Reports (Internet), 11(1), p.185_1 - 185_11, 2021/01

 被引用回数:10 パーセンタイル:75.98(Multidisciplinary Sciences)

シリコンへ6MeV C$$_{60}$$イオン照射すると直径10nmのイオントラック損傷が形成されることを見出した。これは、従来知られているイオンエネルギーしきい値(17MeV)よりもはるかに低いエネルギーである。従来知られているような電子的阻止能に由来したイオントラック形成メカニズムだけでは説明できず、それだけでなく核的阻止能に由来した効果も存在する可能性を示唆している。

論文

Measurement of local temperature around the impact points of fast ions under grazing incidence

古株 弘樹*; Yoon, S.*; Lee, H.*; 中嶋 薫*; 松田 誠; 左高 正雄*; 辻本 将彦*; Toulemonde, M.*; 木村 健二*

Nuclear Instruments and Methods in Physics Research B, 460, p.34 - 37, 2019/12

 被引用回数:0 パーセンタイル:0.02(Instruments & Instrumentation)

Gold and platinum nanoparticles of few-nm size were deposited on amorphous silicon nitride (a-SiN) films. These samples were irradiated with 380 MeV Au ions at grazing incident angles ($$theta$$$$_{i}$$=2$$^{circ}$$-5$$^{circ}$$) to a fluence of ~1$$times$$10$$^{10}$$ ions/cm$$^{2}$$. The irradiated samples were observed using transmission electron microscopy (TEM). Ion tracks were clearly observed as long bright lines. Nanoparticles were found to be desorbed from long and narrow regions along the ion tracks. The surface temperature at the thermal spike produced by the ion impact was evaluated from the observed nanoparticle desorption. The observed temperature distribution is qualitatively explained by a one-dimensional two temperature model (1D-TTM) although there are some discrepancies which may be attributed to the surface effects which are not taken into account in 1D-TTM.

論文

Temperature of thermal spikes induced by swift heavy ions

松崎 勝太*; 林 宏明*; 中嶋 薫*; 松田 誠; 左高 正雄*; 辻本 将彦*; Toulemonde, M.*; 木村 健二*

Nuclear Instruments and Methods in Physics Research B, 406(Part B), p.456 - 459, 2017/09

 被引用回数:4 パーセンタイル:37.32(Instruments & Instrumentation)

Few-nm sized gold, platinum and palladium nanoparticles were deposited on amorphous silicon nitride films. These films were irradiated with 420 MeV Au and 100 MeV Xe ions. Temperature distributions of thermal spikes produced by these ions were evaluated by observing desorption of the nanoparticles from the target surfaces upon ion impact. It was found that the temperature of the thermal spike produced by 420 MeV Au is higher than 100 MeV Xe. The observed temperature of the thermal spike at the entrance surface is slightly lower than that at the exit surface both for 420 MeV Au and 100 MeV Xe ions. These results can be well explained by the inelastic thermal spike model.

論文

Tracing temperature in a nanometer size region in a picosecond time period

中嶋 薫*; 北山 巧*; 林 宏明*; 松田 誠; 左高 正雄*; 辻本 将彦*; Toulemonde, M.*; Bouffard, S.*; 木村 健二*

Scientific Reports (Internet), 5, p.13363_1 - 13363_8, 2015/08

 被引用回数:5 パーセンタイル:41.19(Multidisciplinary Sciences)

Irradiation of materials with either swift heavy ions or slow highly charged ions leads to ultrafast heating on a timescale of several picosecond in a region of several nanometer. This ultrafast local heating result in formation of nanostructures, which provide a number of potential applications in nanotechnologies. These nanostructures are believed to be formed when the local temperature rises beyond the melting or boiling point of the material. Conventional techniques, however, are not applicable to measure temperature in such a localized region in a short time period. Here, we propose a novel method for tracing temperature in a nanometer region in a picosecond time period by utilizing desorption of gold nanoparticles around the ion impact position. The feasibility is examined by comparing with the temperature evolution predicted by a theoretical model.

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